US8015561B2 - System and method for managing memory of Java session objects - Google Patents
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- US8015561B2 US8015561B2 US11/025,316 US2531604A US8015561B2 US 8015561 B2 US8015561 B2 US 8015561B2 US 2531604 A US2531604 A US 2531604A US 8015561 B2 US8015561 B2 US 8015561B2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1479—Generic software techniques for error detection or fault masking
- G06F11/1482—Generic software techniques for error detection or fault masking by means of middleware or OS functionality
- G06F11/1484—Generic software techniques for error detection or fault masking by means of middleware or OS functionality involving virtual machines
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- This invention relates generally to the field of data processing systems. More particularly, the invention relates to an improved system and method for managing memory of session objects within Java-based system architecture.
- a data processing device such as a personal computer or personal information manager (“PIM”)
- PIM personal information manager
- the alphanumeric character(s) must be installed on the data processing device.
- a data processing device In order for a data processing device to display non-English characters, such as the “é” character (“e” with an “accent egu”), a character set, which includes those characters, must first be installed on the data processing device.
- FIG. 1 shows a prior art computing system 100 having N virtual machines 113 , 213 , . . . N 13 .
- the prior art computing system 100 can be viewed as an application server that runs web applications and/or business logic applications for an enterprise (e.g., a corporation, partnership or government agency) to assist the enterprise in performing specific operations in an automated fashion (e.g., automated billing, automated sales, etc.).
- enterprise e.g., a corporation, partnership or government agency
- the prior art computing system 100 runs are extensive amount of concurrent application threads per virtual machine. Specifically, there are X concurrent application threads ( 112 1 through 112 X ) running on virtual machine 113 ; there are Y concurrent application threads ( 212 1 through 212 Y ) running on virtual machine 213 ; . . . and, there are Z concurrent application threads (N 12 1 through N 12 Z ) running on virtual machine N 13 ; where, each of X, Y and Z are a large number.
- a virtual machine is an abstract machine that converts (or “interprets”) abstract code into code that is understandable to a particular type of a hardware platform. For example, if the processing core of computing system 100 included PowerPC microprocessors, each of virtual machines 113 , 213 through N 13 would respectively convert the abstract code of threads 112 1 through 112 X , 212 1 through 212 Y , and N 12 1 through N 12 Z into instructions sequences that a PowerPC microprocessor can execute.
- FIG. 1 shows local memory 115 , 215 , N 15 allocated for each of virtual machines 113 , 213 , . . . N 13 respectively.
- FIG. 1 shows respective regions 116 , 216 , . . . N 16 of each virtual machine's local memory space 115 , 215 , . . . N 15 being allocated as local cache for the corresponding virtual machine 113 , 213 , . . . N 13 .
- a cache is a region where frequently used items are kept in order to enhance operational efficiency. Traditionally, the access time associated with fetching/writing an item to/from a cache is less than the access time associated with other place(s) where the item can be kept (such as a disk file or external database (not shown in FIG. 1 )).
- an object that is subjected to frequent use by a virtual machine may be stored in the virtual machine's cache.
- the combination of the cache's low latency and the frequent use of the particular object by the virtual machine corresponds to a disproportionate share of the virtual machine's fetches being that of the lower latency cache; which, in turn, effectively improves the overall productivity of the virtual machine.
- a problem with the prior art implementation of FIG. 1 is that, a virtual machine can be under the load of a large number of concurrent application threads; and, furthermore, the “crash” of a virtual machine is not an uncommon event. If a virtual machine crashes, generally, all of the concurrent application threads that the virtual machine is actively processing will crash. Thus, if any one of virtual machines 113 , 213 , N 13 were to crash, X, Y or Z application threads would crash along with the crashed virtual machine. With X, Y and Z each being a large number, a large number of applications would crash as a result of the virtual machine crash.
- a method for managing a session with a client is described in which the method receives from the client a request for the session.
- the session is handled with a first virtual machine.
- the method places the session state information for the session into an object located in the first virtual machine's local memory.
- the method writes into a shared memory an object that contains the session state information.
- the method reads the object in the shared memory from the shared memory and places it into a second virtual machine's local memory.
- the method receives from the client another request for the session, and handles the another request with the second virtual machine and the session state information.
- FIG. 1 illustrates a portion of a prior art computing system.
- FIG. 2 illustrates a portion of an improved computing system.
- FIG. 3 illustrates a prior art computing system, which offers no fail over protection for session objects.
- FIG. 4A illustrates fail over protection, before a system crash, through the use of an externally shared memory for storing session objects during an active client session.
- FIG. 4B illustrates fail over protection, after a system crash, through the use of an externally shared memory for storing session objects during an active client session.
- FIG. 5 illustrates a flow chart of the processes used for an externally shared memory for storing session objects during an active client session.
- FIG. 6 illustrates fail over protection through the use of soft references and an externally shared memory for storing session objects during an active client session.
- FIG. 7 illustrates a flow chart of the processes used for soft referencing and an externally shared memory for storing session objects during an active client session.
- FIG. 8 illustrates a block diagram of a computing system that can execute program code stored by an article of manufacture.
- FIG. 2 shows a computing system 200 that is configured with less application threads per virtual machine than the prior art system of FIG. 1 . Less application threads per virtual machine results in less application thread crashes per virtual machine crash; which, in turn, should result in the new system 200 of FIG. 2 exhibiting better reliability than the prior art system 100 of FIG. 1 .
- FIG. 2 which is an extreme representation of the improved approach, only one application thread exists per virtual machine (specifically, thread 122 is being executed by virtual machine 123 ; thread 222 is being executed by virtual machine 223 ; . . . and, thread M 22 is being executed by virtual machine M 23 ).
- the computing system 200 of FIG. 2 may permit a limited number of threads to be concurrently processed by a single virtual machine rather than only one.
- the improved system 200 of FIG. 2 instantiates more virtual machines than the prior art system 100 of FIG. 1 . That is, M>N.
- the prior art system 100 instantiates one virtual machine per CPU while the improved system 200 of FIG. 2 can instantiate multiple virtual machines per CPU.
- a first CPU will be configured to run a single virtual machine while a second CPU in the same system will be configured to run a pair of virtual machines.
- a pair of virtual machines By repeating this pattern for every pair of CPUs, such CPU pairs will instantiate 3 virtual machines per CPU pair (which corresponds to 1.5 virtual machines per CPU).
- the virtual machines 123 , 223 , . . . M 23 of the system 200 of FIG. 2 are configured with less local memory space 125 , 225 , . . . M 25 than the local memory 115 , 215 , . . . N 15 of virtual machines 113 , 213 , . . . N 13 of FIG. 1 .
- Shared memory 230 is memory space that contains items 231 - 238 that can be accessed by more than one virtual machine (and” typically, any virtual machine configured to execute “like” application threads that is coupled to the shared memory 230 ).
- the computing system 200 of FIG. 2 uses more virtual machines with less local memory resources.
- the less local memory resources allocated per virtual machine is compensated for by allowing each virtual machine to access additional memory resources.
- this additional memory space 230 is made “shareable” amongst the virtual machines 123 , 223 , . . . M 23 .
- an object residing in shared memory 230 should not contain a reference to an object located in a virtual machine's local memory because an object with a reference to an unreachable object is generally deemed “non useable”.
- a “closure” is a group of one or more objects where every reference stemming from an object in the group that references another object does not reference an object outside the group. That is, all the object-to-object references of the group can be viewed as closing upon and/or staying within the confines of the group itself. Note that a single object without any references stemming from can be viewed as meeting the definition of a closure.
- a “shared closure” is a closure in which each of the closure's objects are “shareable”.
- a shareable object is an object that can be used by other virtual machines that store and retrieve objects from the shared memory 230 .
- one aspect of a shareable object is that it does not possess a reference to another object that is located in a virtual machine's local memory. Other conditions that an object must meet in order to be deemed shareable may also be effected.
- a shareable object must also posses the following characteristics: 1) it is an instance of a class that is serializable; 2) it is an instance of a class that does not execute any custom serializing or deserializing code; 3) it is an instance of a class whose base classes are all serializable; 4) it is an instance of a class whose member fields are all serializable; 5) it is an instance of a class that does not interfere with proper operation of a garbage collection algorithm; 6) it has no transient fields; and, 7) its finalize ( ) method is not overwritten.
- a copy operation used to copy a closure into shared memory 230 can be shown to be semantically equivalent to serialization and deserialization of the objects in the closure.
- Examples include instances of the Java 2 Platform, Standard Edition 1.3 java.lang.String class and java.util.Hashtable class.
- a container is used to confine/define the operating environment for the application thread(s) that are executed within the container.
- containers also provide a family of services that applications executed within the container may use (e.g., (e.g., Java Naming and Directory Interface (JNDI), Java Database Connectivity (JDBC), Java Messaging Service (JMS) among others).
- JNDI Java Naming and Directory Interface
- JDBC Java Database Connectivity
- JMS Java Messaging Service
- a first type of container may contain instances of pages and servlets for executing a web based “presentation” for one or more applications.
- a second type of container may contain granules of functionality (generically referred to as “components” and, in the context of Java, referred to as “beans”) that reference one another in sequence so that, when executed according to the sequence, a more comprehensive overall “business logic” application is realized (e.g., stringing revenue calculation, expense calculation and tax calculation components together to implement a profit calculation application).
- FIG. 3 shows that more than one thread can be actively processed by the virtual machine 323 depicted therein.
- the number of threads that the virtual machine 323 can concurrently entertain should be limited (e.g., to some fixed number) to reduce the exposure to a virtual machine crash.
- the default number of concurrently executed threads is 5.
- the number of concurrently executed threads is a configurable parameter so that, conceivably, for example, in a first system deployment there are 10 concurrent threads per virtual machine, in a second system deployment there are 5 concurrent threads per virtual machine, in a third system deployment there is 1 concurrent thread per virtual machine. It is expected that a number of practical system deployments would choose less than 10 concurrent threads per virtual machine.
- a Computing System 300 comprises a Virtual Machine (hereinafter “VM”) 310 , and a local memory 315 where at least one session object is kept when requests are made from client 305 .
- VM Virtual Machine
- client 305 communicates with and makes a first request 320 to VM 310
- a session object 325 is created and placed in local memory 315 .
- Object 325 is activated upon its creation.
- client 305 makes a second request 330 to VM 310
- the session's state information is written to object 325 .
- Client 305 may make additional N requests to VM 310 . Each additional request would alter the client's state information, which would in turn be written to session object 325 .
- Session state information contains details of a client's session with an application. In one embodiment, this might include a client who visits a website. In such an embodiment, the state information would include what page(s) the client has visited or currently visiting, where the client came from (e.g. the referring website), and what information the client has accessed. If the website sells goods or service, the state information might also include the goods and/or services the client has requested to purchase (e.g., a shopping cart), as well as address and payment information. As additional requests are made from client 305 , the session's state information is continuously written to session object 325 .
- FIG. 4A illustrates fail over protection of session objects by using a shared memory.
- computing system 400 two VMs are present. Each VM also comprises a local memory.
- VM 405 has a local memory 406 .
- VM 408 has a local memory 409 .
- a computing system more than two VMs per computing system are possible.
- a Virtual Machine also known as an interpreter, is a middleware component on a computing system.
- the purpose of a VM or interpreter is to allow software applications to be written independent of the hardware platform they will run on.
- software applications had to be written specifically to run on a single hardware platform such an Apple Macintosh, IBM PC, Sun Solaris, or IBM RISC. If an application were written for an IBM PC, its code is not compatible with a Macintosh platform and vise versa.
- Virtual Machines remove this limitation by allowing software to be written once, yet be capable of running on multiple platforms.
- the VM acts as a translator by receiving abstract code, as an input (e.g., Java bytecode) and outputting language the specific hardware platform can understand. Hence, the alternate name of “interpreter”.
- VM 405 contains a local memory 406 where session objects are created upon requests made from client 401 .
- VM 408 also contains a local memory 409 , which is also capable of storing session objects from client 401 .
- a local memory may exist for each VM. In a typical embodiment, a local memory is allotted for a single VM, such that no other VMs are permitted to utilize the local memory of another VM.
- a shared memory 407 exists where session objects from VM 405 and VM 408 may be stored. Shared memory 407 can be viewed as being “external” to VM 405 , VM 408 and any other VMs, but “internal” to the overall computing system 400 .
- VM 405 , VM 408 and any other VMs coupled to system 400 may be granted access to shared memory 407 in order to read or write information to and from it.
- Dispatcher 404 is responsible for routing session requests, from client 401 to one of the VMs. Dispatcher 404 will query the existing workload of computing system 400 to determine which VM is best equipped to handle client 401 's session.
- VM 405 is assigned to handle the session with client 401 .
- a first session object 410 is created and placed in local memory 406 .
- object 410 is a local object and only exists in one location (local memory 406 ).
- Object 410 (e.g., as part of the initial communication in an HTTP session with client 401 ) is in an activated state upon its creation.
- object 410 is automatically deactivated after its creation and a copy 411 is written to shared memory 407 , where copy 411 remains in a deactivated state.
- a new session object is deactivated and written to shared memory after the successful handling of each client request.
- This embodiment ensures that session fail over exists between each request, during the same session, from client 401 .
- object 410 is not deactivated and written to shared memory 407 immediately after the successful handling of each client request. Instead, a predetermined period of time is set by which object 410 remains in local memory 406 . During this time, it is possible than multiple requests from client 401 could be made. Each state change in client 401 's session would be continuously written to object 410 . Once the predetermined time interval expires, object 410 would then be deactivated and written to shared memory 407 as copy 411 .
- copy 411 is read from shared memory 407 and placed into local memory 406 as new session object 412 .
- object 412 would be copied to local memory 406 after each request from client 401 .
- the currently activated object in local memory 406 is always copied to shared memory 407 after the receipt of each client request, after the initial request is received.
- the same object in local memory 406 may be used for two or more consecutive requests received within a predetermined period of time.
- object 411 would not be copied to local memory 406 , based on VM 405 receiving a new request from client 401 , unless the predetermined period of time has expired. Once time has expired, object 410 is copied into shared memory 407 as object 411 . Upon the next client request received, object 411 would then be copied from shared memory 407 to local memory 406 , as object 412 .
- object 412 Upon its creation and placement in local memory 406 , object 412 is changed from a deactivated to an activated state. Changes to the session's state information are stored in new object 412 . Once the changes are written to new object 412 , it is placed in the deactivated state and another copy 413 is written to shared memory 407 . Based on the embodiments mentioned above, copy 413 could be written to shared memory 407 after each client request, or only after a predetermined time interval expires. Copy 413 also remains in the deactivated state unless read back to local memory 406 at a later time (if client 401 makes further requests).
- FIG. 4B illustrates the same system as shown in FIG. 4A , but with a VM crash occurring at VM 405 .
- VM 205 has crashed, which is represented by a large “X” placed over VM 405 .
- VM 408 (which may be instantiated for the purpose of resuming client 401 's session) would be able to retrieve the latest session object from shared memory 407 .
- object 413 contains the latest session information.
- Object 413 is read from shared memory 407 and placed into local memory 409 as new session object 414 . This process allows client 401 's current session to continue even though VM 405 is no longer available.
- the prior art system of FIG. 3 only maintains session objects within the local memory of each VM. If VM 310 were to crash, all the existing session objects would be lost since they were only present in local memory 315 , which was erased due to the crash. However, Computing System 400 (of FIGS. 4A and 4B ) provides fail over protection due to the presence of shared memory 407 . Even though a crash of VM 405 has occurred, the session's latest object for client 401 's session exists in shared memory 407 . Backup VM 408 could easily retrieve the latest session object from shared memory 407 such that no loss of session data would occur.
- FIG. 5 illustrates a flowchart of the processes by which two or more VMs would use a shared memory to store and retrieve session objects from an individual client session.
- a client attempts 510 to establish a communication session with a VM (e.g., by sending an HTTP request for access to an application). If there are multiple VMs available, a dispatcher is responsible for routing the client request to one of them.
- a session object is created 520 for this specific client's session.
- the session object is activated upon creation and placed in local memory of the VM.
- the session object is deactivated and a copy is written 530 to the shared memory.
- the copy placed in the shared memory now resides external to the VM and may be accessed by all VMs connected to the shared memory.
- the client again invokes 540 the session with the VM (e.g., with another request).
- the object placed in shared memory is used instead. That is, the session object is read from the shared memory and placed in local memory 550 . The object is activated so that the client may use it. Session activity taken by the client is written 560 to the session object in local memory. The session object is eventually deactivated and copied 570 to the externally shared memory, allowing it to be accessed by any other VM connected to the shared memory.
- a “dead session” is the physical instance of an “active session”, which is no longer in the scope of a client request and cannot be accessed or reached by the application any longer.
- this object is known as an unreachable object.
- An unreachable object is one that can't be accessed from an application because the object is no longer referenced by any other objects. Since a “dead session” object is no longer accessible, it becomes useless to local memory 406 .
- GC Java Garbage Collector
- object 410 and object 412 become “dead session” objects after they are deactivated and a copy of them are written to shared memory 407 .
- local memory 406 could end up with many dead session objects that are eventually deleted in order to free up memory. If there are numerous clients accessing VM 405 , the free memory in local memory 406 can become constrained or run out. Therefore, unreachable or dead objects should be deleted.
- FIG. 6 An exemplary system according to another embodiment is illustrated in FIG. 6 .
- FIG. 4A illustrates fail over protection of session object by using shared memory.
- FIG. 6 uses soft references between session objects to allow for the possibility of their reuse.
- System 600 contains two VMs.
- VM 605 contains a local memory 606 where session objects are created when requests are made from client 601 .
- VM 608 also contains a local memory 609 .
- a shared memory 607 exists that is accessible to both VM 605 and VM 608 .
- Shared memory 607 can be viewed as being “external” to VM 605 , VM 608 and any other VMs, but “internal” to Computing System 600 .
- VM 605 , VM 608 and other VMs within system 600 may be granted access to shared memory 607 in order to read or write information to and from it.
- System 600 also contains a session manager 625 .
- Session manager 625 is responsible for creating soft references (described below) to session objects.
- Dispatcher 604 is responsible for routing session requests, from client 601 to one of the VMs. Dispatcher 604 will query the existing workload of Computing System 600 to determine which VM is best equipped to handle client 601 's session.
- VM 605 is assigned to handle the session with client 601 .
- a first session object 610 is created and placed in local memory 606 .
- object 610 is a local object and only exists in one location (local memory 606 ).
- Object 610 (e.g., as part of the initial communication in an HTTP session with client 601 ) is in an activated state upon its creation.
- object 610 is deactivated and written to shared memory 607 as object 611 .
- Object 611 also is in a deactivated state while residing in shared memory 607 .
- a “soft reference” 616 is created from session manager 625 to object 610 .
- such a reference is created by calling Java method java.lang.ref.SoftReference( ).
- Creating a “soft reference” to object 610 provides an advantage over the embodiment illustrated in FIG. 4A .
- FIG. 4A once object 410 was deactivated it became a “dead session” object and would be automatically deleted by the GC since it was not referenced by any other objects (e.g., unreachable).
- creating a “soft reference” to object 610 allows the object to remain reachable and available until the physical memory of local memory 606 runs low. Such a softly referenced object would remain in local memory 606 as long as there is adequate free memory. This is due to the nature of the GC to forego the deletion of such objects until physical memory runs too low.
- the purpose of creating a “soft reference” to object 610 from session manager 625 is to provide for the possible reuse of object 610 at a later time.
- the alternative (as taught in FIG. 4A ) is to automatically read object 611 from shared memory 607 and write another copy of it to local memory 606 .
- this approach involves some overhead in the form of read/write accesses to shared memory 607 .
- VM 605 if and when client 601 makes additional session requests, VM 605 will attempt to reuse object 610 .
- VM 605 first looks to local memory 606 to see if object 610 still exists (e.g., it has not been deleted by the GC because of the soft reference). If object 610 still exists, VM 605 will then verify its contents.
- object 610 may be reused. However, it is possible that object 611 was altered by another VM, while residing in shared memory 607 . Under such circumstances, object 610 (in local memory) and object 611 (in shared memory) could have different information. If this was the case, or if the GC deleted object 610 , object 610 is not reusable and object 611 would be read from shared memory 607 and a new copy object 612 would be written to local memory 606 .
- VM 605 writes the changes from the client's session state to object 610 or 612 (depending on whether 610 was reusable or a new object 612 had to be copied from shared memory 607 ). From here, object 610 or 612 is deactivated and a copy 613 of object 610 or 612 is written to shared memory 607 .
- Another “soft reference” 617 is created from session manager 625 to object 610 or 612 (depending on which was used last). This allows for object 610 / 612 to remain available for reuse as long as adequate free memory is available and the GC does not remove object 610 / 612 .
- FIG. 7 illustrates a flowchart of the process by which an externally shared memory is used by two or more VM's to store and retrieve session objects from an individual client session. This process differs from FIG. 5 by creating a “soft reference” to all locally created session objects so that their reuse may be possible. This could reduce the number of read requests from shared memory since objects in local memory may be reusable.
- a client attempts 710 to establish a communication session with a VM (e.g., by sending an HTTP request for access to an application). If there are multiple VMs available, a dispatcher is responsible for routing the client request to one of them.
- a session object is created 720 on the chosen VM for this specific client. The session object is activated upon creation and placed in local memory of the chosen VM.
- the object is deactivated 725 . Deactivation allows for the object to be placed in a serializable state, permitting it to be copied to another location.
- a copy of the session object is written 730 to shared memory.
- a “soft reference” is created 740 from the session manager to the session object in local memory. With the object in local memory being softly referenced, the GC will only remove this object if physical memory is low. As long as local memory is sufficient, this object will remain through the client's session.
- the client again invokes 750 the session with the VM.
- the VM first looks in local memory to see if the softly referenced session object still exists 760 (e.g. the object was not deleted by the GC.) If there is a softly referenced session object in local memory that is usable, the VM verifies the contents of the object in local memory to the object in shared memory. If their contents are the same 765 , the VM can reuse the object from local memory, after reactivating it. Changes to the client's session state are written 770 back to the object. The session object is deactivated 787 and written back 790 to shared memory. Lastly, a “soft reference” is created 795 from the session manager to the session object in local memory.
- the VM If there is no softly referenced object in local memory, or if there is but it contains different contents than the object in shared memory, the VM reads the object 780 in shared memory back to local memory. The VM then reactivates the object and writes the changes 785 from the client session's state to the session object in local memory. Next, the session object is deactivated 787 and copied back 790 to shared memory. Lastly, a “soft reference” is created 795 from the session manager to the session object in local memory. Procedures 750 to 795 would continuously occur each time another client revives the session (e.g., with another request).
- the server may be Java 2 Enterprise Edition (“J2EE”) server nodes, which support Enterprise Java Bean (“EJB”) components and EJB containers (at the business layer) and Servlets and Java Server Pages (“JSP”) (at the presentation layer).
- J2EE Java 2 Enterprise Edition
- EJB Enterprise Java Bean
- JSP Java Server Pages
- other embodiments may be implemented in the context of various different software platforms including, by way of example, Microsoft .NET, Windows/NT, Microsoft Transaction Server (MTS), the Advanced Business Application Programming (“ABAP”) platforms developed by SAP AG and comparable platforms.
- Processes taught by the discussion above may be performed with program code such as machine-executable instructions, which cause a machine (such as a “virtual machine”, a general-purpose processor disposed on a semiconductor chip or special-purpose processor disposed on a semiconductor chip) to perform certain functions.
- program code such as machine-executable instructions, which cause a machine (such as a “virtual machine”, a general-purpose processor disposed on a semiconductor chip or special-purpose processor disposed on a semiconductor chip) to perform certain functions.
- a machine such as a “virtual machine”, a general-purpose processor disposed on a semiconductor chip or special-purpose processor disposed on a semiconductor chip
- these functions may be performed by specific hardware components that contain hardwired logic for performing the functions, or by any combination of programmed computer components and custom hardware components.
- An article of manufacture may be used to store program code.
- An article of manufacture that stores program code may be embodied as, but is not limited to, one or more memories (e.g., one or more flash memories, random access memories (static, dynamic or other)), optical disks, CD-ROMs, DVD ROMs, EPROMs, EEPROMs, magnetic or optical cards or other type of machine-readable media suitable for storing electronic instructions.
- Program code may also be downloaded from a remote computer (e.g., a server) to a requesting computer (e.g., a client) by way of data signals embodied in a propagation medium (e.g., via a communication link (e.g., a network connection)).
- FIG. 8 illustrates a block diagram of a computing system 800 that can execute program code stored by an article of manufacture. It is important to recognize that the computing system block diagram of FIG. 8 is just one of various computing system architectures.
- the applicable article of manufacture may include one or more fixed components (such as a hard disk drive 802 or memory 805 ) and/or various movable components such as a CD ROM 803 , a compact disc, a magnetic tape, etc.
- RAM Random Access Memory
- the processing core may include one or more processors and a memory controller function.
- a virtual machine or “interpreter” may run on top of the processing core (architecturally speaking) in order to convert abstract code (e.g., Java bytecode) into instructions that are understandable to the specific processor(s) of the processing core 806 .
- abstract code e.g., Java bytecode
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EP1677199A2 (en) | 2006-07-05 |
EP1677199A3 (en) | 2006-10-04 |
US20060143609A1 (en) | 2006-06-29 |
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